There was an article in BUILDING ENERGY SIMULATION, Vol 19, No 1, Spring 1998, called "Underground Surfaces How to Get a Better Underground Surface Heat Transfer Calculation in DOE-2.1E". It outlined the process for converting F- and C-factors into DOE2 inputs. That article's process required changing both the U-EFFECTIVE and a Ficticious R Material (Typically called UF/UWMat in eQUEST).

Does anyone know why they required changing both the U-EFFECTIVE and the Ficticious R (UF/UWMat)? We've run some parametrics and found the energy use difference between changing only U-EFFECTIVE versus changing both the U-EFFECTIVE and Ficticious R to be small.

-Eric